No. 1745. AMERICA'S BEER OF THE GEXVS \<>\II\ COCKERELL. 295 



hoars nodules, not (he third and fourth, respectively, as stated in the 

 original description." In this species the hair of the thorax above 

 is pale yellowish-gray, unlike the fulvous of apacha or the seal-brown 

 of marginipennis; the tegulae are darker than in apacha, but not 

 so dark as in marginipennis. 



GROUP OF NOMIA ME SI I.I..K 



Known only from a single male, the type of A', mesilla (Cockerell). 

 It is similar in most respects to the males of the heteropoda group, 

 but the middle femora are less modified, the middle tibia' have no 

 spurs, and there are other differences. The abdominal hair-bands 

 are very distinct. The insect was taken by Mr. C. M. Barber at 

 Mesilla, Xew Mexico. 



GROUP OF NOMIA BOLLIANA. 



The only species known is X. bolliana Cockerell, 1910, from Texas. 

 The female looks at first sight just like N. triangulifera, agreeing in 

 size, build, color, and manner of collecting pollen. Upon (dose 

 comparison many differences are apparent, such as the narrowly 

 crescentic area of metathorax, the more sparsely punctured first 

 abdominal segment, and the pellucid rufo-fulvous tegulae, which are 

 quite elongate, sinuate on the outer margin, in the manner of the 

 lieteropoda group. The tibiae and tarsi are ferruginous. The wings 

 are colored as in X. apacha. The male is very different from that of 

 X. triangulifera, the following characters being distinctive: Antennae 

 long, black, the ilagelluni crenulated, with the apical joint flattened 

 and broadened, as in the heteropoda group: face broad, densely 

 covered with yellowish-white hair; tongue narrow apically, broadened 

 basally, very hairy; vertex and thorax above with very pale yellowish 

 hair, colored as in X. xerophila; area of metathorax strongly plicate: 

 abdomen densely punctured, first three segments constricted; fourth 

 ventral segment with median depression parallel-sided, not at all 

 triangular (but it may broaden under the margin of third), and its 

 lateral angles not elevated; fifth ventral with a pair of nodules: 

 femora black, except knees, tibia' and tarsi ; ferruginous; middle femora 

 very little swollen, inclined to lie keeled beneath; middle tibia' and 

 tarsi ordinary, the tibial spur present; hind trochanters produced 

 to a large obtuse tooth, and with a little basal process on outer side; 

 hind femora much swollen, very convex above; hind tibia' broadly 

 triangular, the lamina produced to a prominent submedian angle, 

 and with also an apical process; hind basitarsus not excessively long. 



This species was described from a single female in the Berlin 

 Museum. The l\ S. National Museum contains both -rx,.^. from 



a Entomologist, \'n\ . L899, p. 266. 



